Vehicles Relay Life Comprehensive Laboratory Bench

The relay is one kind of the automatic control electric appliance which acts based on a specific form input signal。It is widely applied to all kinds of control system。The automobile is made up of four major parts,which are the engine,the chassis,the electric appliance equipment and the automobile body together with its appurtenance。While the key indicator of the automobile electric appliance is the relay equipment life, which also is the goal to which the users and the producers all extremely pay attention。The request to the automobile relay is small volume;big electric current (some reaches 70A);firm structure and vibration-proof;water,oil, moisture and salt mist resistant,as well as ultra static sound and so on。Common relay service life includes machinery signature and electricity life,but the mechanical life outdoes a number magnitude compared to the electricity life,therefore,the electricity life has decided the relay service life。This topic based on vehicles relay using environment and load situation obtains the condition where the relay closes and break。The topic has also studied hardware part and software part of the vehicles relay electric life-test rack,taking the industry control computer as center。This article is mainly divided two part:(1)Main return route part,including power unit,load part and control succession(2) Computer observation and control part,including computer control section and computer survey partThis graduation project automatically records examination data and writes up the test report。The users may establish experimental frequency; the times of the experiments;the expires times;Load factor (duty factor);Electronic contact closed,the parameter of separation threshold voltage and so on;According to the request,the equipment carries on the experiment automatically and releases time according to electronic contact closed and separation threshold voltage value computation pull-up time;Examine the electronic contact voltage and gate limiting value comparison,judging whether expires;Examine and demonstrate the electronic contact voltage waveform,testing voltage current waveform.